On other platforms:

FREE

FREE

App description:

Karaopocket is back!
The Karaoke software most downloaded on Pocket PC is finally available on iPhone / iPad.
It is now compatible with Dropbox.
For those who do not yet know, Karaopocket is a karaoke software that can read any file with the .kar & the .cdg format.
Thousands of files of this type are available online. (Go on www.midikaraoke.com or http://www.vanbasco.com/midisearch.html for example and have fun)
Sing with all your heart with the help of your iPhone!
UNIQUES FEATURES
- It's the only player on the appstore that could read .kar AND .cdg !
- Great midi playback.
- Flying tomatoes when playing .kar. Yes.. It's funny.
Usage:
The songs can be loaded in 4 different ways:
- Link Karaopocket to your cloud account (Dropbox, Google Drive or webdav) Karaopocket will then download all the songs located in the specified folder.
- Using the web server of Karaopocket (+ button followed by 'upload from desktop')
- Using the iTunes File Sharing (see http://support.apple.com/kb/ht4094 for more information)

- Either by loading a .kar file from Mobile Safari and asking him to open it with Karaopocket.
What people said (about the Pocket PC version):
pocketpcaddict.com
"Lampshades on the head getting old? Tired of falling face first into the Christmas turkey for laughs? If you are looking for a brand new way to embarass yourself this Christmas, your Pocket PC Can help!
Kara-O-Pocket is karaoke software that you can use on your Pocket PC to sing the night away - or sing your party guests away - whichever the case may be!
Everyone knows I'm kidding above, Kara-O looks like fun if you are into karaoke. I personally never got into the karaoke trend because I remember seeing couples in the local Karaoke bar getting up drunk singing Time After Time to each other and looking pretty darn ridiculous. Not to mention there was always some 50 year old dude who simply HAD to get up and sing Madonna's Like a Virgin....
What do you all think about Karaoke? Will this software make you feel "Touched for the very first time"?"
Pocket.at(austria)
"Kara-O-Pocket ist eine Karaoke-Software für Pocket PCs, die es in zwei Ausführungen gibt.
Die Karaoke-Software Kara-O-Pocket ist in zwei Varianten erhältlich: Version 1 ist kostenlos erhältlich und man damit MOD-, S3M- und XM-Dateien verwenden. Will man auf KAR-Files nutzen (und davon gibt es Tausende im Web), so muss man zu Version 2 greifen und ein paar Dollar investieren. In beiden Fällen gibt es eine Menge Features und man kann eigene Songs erstellen, diese im Web bereitstellen oder von anderen downloaden."
staticfuzz.com
"Turn Your Pocket PC into a Karaoke Machine
Kara-o-pocket's new version 2.0 can read .kar files, thousands of which are freely available on the net. [...]"
Pocket pc addict.com
Lampshades on the head getting old? Tired of falling face first into the Christmas turkey for laughs? If you are looking for a brand new way to embarass yourself this Christmas, your Pocket PC Can help!
Kara-O-Pocket is karaoke software that you can use on your Pocket PC to sing the night away - or sing your party guests away - whichever the case may be!
Everyone knows I'm kidding above, Kara-O looks like fun if you are into karaoke. I personally never got into the karaoke trend because I remember seeing couples in the local Karaoke bar getting up drunk singing Time After Time to each other and looking pretty darn ridiculous. Not to mention there was always some 50 year old dude who simply HAD to get up and sing Madonna's Like a Virgin....
What do you all think about Karaoke? Will this software make you feel "Touched for the very first time"?